She made herself tea, ate a large number of biscuits, and stoked up the fire, so that there might be smoke visible in the morning.

The air in the room seems to thicken with barely visible smoke.

One demand on the RM8B was that it had to be free of visible smoke.

Amateur video purported the scene to have black smoke billowing into the sky, visible throughout the city.

The flame burned clean, with no visible smoke or soot.

Measures were often taken to prevent the engines from emitting visible smoke or steam.

The vertical exhaust pipe puttered up its barely visible blue smoke.

Why had there been no smoke visible from the chimney?

Does this kind of furnace produce visible smoke?

There was no smoke visible ahead, and the prints were those of shod horses.